| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Sep.11 - Sep. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 43w - Powder River Basin | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 82637 - Glenrock, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 19 | 25 | 31 | 40 | 49 | 55 | 54 | 43 | 33 | 23 | 17 | 34 |
| Avg Max Temp (°F) | 37 | 41 | 49 | 58 | 68 | 80 | 88 | 86 | 75 | 62 | 45 | 37 | 60 |
| Avg Precip (In.) | .36 | .44 | .77 | 1.8 | 2.59 | 1.42 | 1.2 | .77 | 1.16 | 1.11 | .7 | .4 | 12.71 |